Paul Ryan - Has all the intangibles and will have national exposure/battle-testing. If "extreme" label sticks, he could see Rubio pass him by.
Marco Rubio - If not for Veep incumbancy of Ryan he'd be an easy top choice, now he'll have to fight for it - but he's right there with Ryan.
Scott Walker - A wildcard that could catapult to the top of the list, but like two actors from the same movie vying for the same Oscar he could get "cancelled out" by Ryan.
Chris Christie - Has the attitude and will likely be looking for work, but liberal positions on the social issues will sink him.
Mike Pence - Who?
Rand Paul - He's another wildcard, could get traction easily, but won't have establishment backing.
Bobby Jindal - Just isn't an inspiring speaker, and others (above) are better at stating the case.
Rick Santorum - Maybe higher if he loses the perpetually constipated look. One spot higher.
Huntsman - No way in hell.